Arithmetic sequence question

[her]

[FONT=&quot]Violin lesson fees started at $46 per hour in January, 1990, and gradually increased by $2 .50 every year. How much is the hourly cost in January of 2014? Hint: It’s not a good idea to just apply tn=t1+d(n-1). How much do you pay in January 1991? 1992? Then use the pattern you see.


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[Deleted member 4993]

Violin lesson fees started at $46 per hour in January, 1990, and gradually increased by $2 .50 every year. How much is the hourly cost in January of 2014? Hint: It’s not a good idea to just apply tn=t1+d(n-1). How much do you pay in January 1991? 1992? Then use the pattern you see.

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[mmm4444bot]

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[HallsofIvy]

[FONT=&quot]Violin lesson fees started at $46 per hour in January, 1990, and gradually increased by $2 .50 every year. How much is the hourly cost in January of 2014? Hint: It’s not a good idea to just apply tn=t1+d(n-1). How much do you pay in January 1991? 1992? Then use the pattern you see.


[/FONT]

"Violin lesson fees started at $46 per hour in January, 1990, and gradually increased by $2 .50 every year."

So in 1991, the lessons cost $46+ 2.50= $48.50. In 1992, $48.50+ 2.50= $51.00. How much in 1993? How much are the fees increasing every two years? How many "2 year" periods are there form 1990 to 2014?

 

[Denis]

It’s not a good idea to just apply tn=t1+d(n-1).

Why not?